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I Initial responsibility chain model Definition: multiple objects have the opportunity to process the request, so as to avoid the relationship between the sender and receiver of the request. Connect the object into a chain and pass the request along a chain until an object processes it. It may be a little obscure. Let's take a look at an exam ...

1, Node JS event loop        Node.js is a single process and single thread application, but because of the asynchronous execution callback interface provided by V8 engine, a large number of concurrency can be handled through these interfaces, so the performance is very high.     &nbs ...

catalogue 1.1 two dimensional coordinate system 1.2 movement of 2D conversion 1. Syntax: 2 . a key: 3. Center a box horizontally and vertically 1.3 rotation of 2D conversion 1. Syntax: 2. Key points: 3. Rotate the case and write the triangle with code: 1.4 transform origin of 2D conversion center point 1. Syntax: 2. Key points: 3. ...

Two timers provided by window setTimeout()setInterval() window. SetTimeout (calling function, [number of milliseconds delayed]); The setTimeout() method is used to set a timer. When the delay time is up, the calling function will be executed, and it will end only once. <script> //The delay time is in milliseconds ...

catalogue 1 simple introduction 1.1 creating collections 1.2 create request 1.3 set assertion 1.4 assembly test 1.5 export * json script 1.6 collection and sharing 1.7 authority management 2 second order use 2.1 setting environment variables 2.1.1 new environment 2.1.2 setting environment variables 2.1.3 setting environment variable ...

String extraction method slice() substr() substring() Function: returns a substring of the corresponding string, and both receive one or two parameters. Difference: for slice() and substituting(), the first parameter represents the starting position of the substring, the second parameter represents the ending position of the substring extract ...

In the traditional front and back-end development, permission management is mainly carried out through filters or interceptors (the permission management framework itself also realizes the function through filters). If users do not have a role or a permission, they cannot access a page. However, in the separation of front and back ends, the pa ...

This article introduces the usage scenarios of advanced TypeScript types in detail, which can provide some help for the daily use of TypeScript. preface This article has been included in Github: https://github.com/beichensky/Blog In the middle, pass by and point a Star 1, Advanced type & cross type Cross type is to combine multiple typ ...

catalogue Part I: scope and closure Chapter 1. What is the scope Chapter 2} lexical scope Chapter 3 function scope and block scope Chapter 4 - lifting Chapter 5: scope closure The second part is} this and object model Chapter 1} about this Chapter 2} this comprehensive analysis Chapter 3: object Chapter 4} mixed object "class&qu ...

Author: KUMAR HARSHTranslator: front end XiaozhiSource: blogThere are dreams and dry goods. Wechat search [Daqian world] pays attention to this bowl washing wisdom who is still washing dishes in the early morning.This article GitHub https://github.com/qq449245884/xiaozhi It has been included. There are complete test sites, materials and my ser ...